Fully Grouted Multi-Point Piezometer String

Fully grouted installation permits multiple piezometer to be simply and reliably installed in a single borehole


Fully grouted installation permits multiple piezometers to be simply and reliably installed in a single borehole. The piezometer string and grout pipe are placed in the borehole and cement-bentonite grout is pumped until the borehole is filled.

Multi-point Piezometer Strings allow for multiple Vibrating Wire Piezometers to be connected on a single cable. This facilitates the installation of fully grouted multiple piezometers. The single cable prevents vertical void channels. Tough polyurethane jacketed, Kevlar® reinforced, non-stretch cable is employed to withstand the rigors of installation and is entirely water-blocked to minimize any leakage. No conductors are shared to maximize independent reliability of each sensor.


  • Over range: 2 X F.S.
  • Resolution: 0.025% F.S. minimum
  • Accuracy: 0.1% F.S.
  • Operating Temperature: -20 to 80°C (-4 to 176°F)
  • Diaphragm Displacement: <0.001 cc at F.S.
  • Thermal Zero Shift: <0.05% F.S./°C
  • Materials: Hermetically sealed stainless steel housing
  • Thermistor Type: NTC 3K Ohms @ 25°C
  • Thermistor Interchangeability: ±0.2°C
  • Thermistor Resolution: 0.1°C
  • Filter: 50 micron sintered filter


  • Ideal when more than one piezometer reading is needed at various depths – at the same location.
  • Assessing performance and investigating stability of:
    – earth fill dams & embankments
    – slope stability
  • Monitoring of:
    – pressures behind retaining walls and diaphragm walls
    – pore pressures during fill or excavation
    – pore pressure in land reclamation applications


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